I am getting the same problem, I checked my logs and this is what it says
L 11/30/2014 - 08:03:01: SourceMod error session started
L 11/30/2014 - 08:03:01: Info (map "surf_bigramp_v2b") (file "errors_20141130.log")
L 11/30/2014 - 08:03:01: [SM] Unable to load extension "cssdm.ext": Could not find signature "UTIL_Remove"
L 11/30/2014 - 08:03:01: [SM] Unable to load plugin "cssdm\dm_basics.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:03:01: [SM] Unable to load plugin "cssdm\dm_bot_quotas.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:03:01: [SM] Unable to load plugin "cssdm\dm_equipment.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:03:01: [SM] Unable to load plugin "cssdm\dm_preset_spawns.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:03:01: [SM] Unable to load plugin "cssdm\dm_spawn_protection.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:03:03: Error log file session closed.
L 11/30/2014 - 08:18:42: SourceMod error session started
L 11/30/2014 - 08:18:42: Info (map "surf_bigramp_v2b") (file "errors_20141130.log")
L 11/30/2014 - 08:18:42: [SM] Unable to load extension "cssdm.ext": Could not find signature "UTIL_Remove"
L 11/30/2014 - 08:18:42: [SM] Unable to load plugin "cssdm\dm_basics.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:18:42: [SM] Unable to load plugin "cssdm\dm_bot_quotas.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:18:42: [SM] Unable to load plugin "cssdm\dm_equipment.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:18:42: [SM] Unable to load plugin "cssdm\dm_preset_spawns.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:18:42: [SM] Unable to load plugin "cssdm\dm_spawn_protection.smx": Required extension "CS:S DM" file("cssdm.ext") not running
L 11/30/2014 - 08:19:51: Error log file session closed.
L 11/30/2014 - 08:20
9: SourceMod error session started
L 11/30/2014 - 08:20
9: Info (map "surf_bigramp_v2b") (file "errors_20141130.log")
L 11/30/2014 - 08:20
9: [cssdm\dm_preset_spawns.smx] Could not find spawn point file "cfg/cssdm/spawns/surf_bigramp_v2b.txt"
L 11/30/2014 - 08:20
9: [cssdm\dm_preset_spawns.smx] Defaulting to map-based spawns!
L 11/30/2014 - 08:21:05: SourceMod error session started
L 11/30/2014 - 08:21:05: Info (map "surf_bigramp_v2b") (file "errors_20141130.log")
L 11/30/2014 - 08:21:05: [cssdm\dm_preset_spawns.smx] Could not find spawn point file "cfg/cssdm/spawns/surf_bigramp_v2b.txt"
L 11/30/2014 - 08:21:05: [cssdm\dm_preset_spawns.smx] Defaulting to map-based spawns!
L 11/30/2014 - 08:21:16: Error log file session closed.
Any help would be greatly appreciated!